how to enter data with excel in health research · previous plt donation lab findings hemoglobin...
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How to enter data with Excel in health research
Vo Tuan Khoa
Epidemiological Research Training Course VI-2, 2015
Outline
• Introduction to Excel
• Prepare data with Excel
• Data enter with Excel
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Introduction to Excel
• Microsoft Excel is a useful spreadsheet program
• Not designed to be a research data entry tool → commonly used because almost researcher knows how to use it basically
• Data files from Excel can be shared or imported directly into files formatted by most statistical software (SPSS, Stata, R, Minitab)
• Limitation: spreadsheets containing less than 256 variables (columns) and 65,536 records (rows).
Column label (variable)
Row (record)
Cell (data)
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Prepare data with Excel
1. Well-designed protocol (conceptual framework)
2. Questionnaire form (verify all variables if nessessary and clarify format)
3. Making data dictionaries
4. Making data tables
repeat Double platelet apheResis for donAtion to Compare the safety
dUration: an interventionaL study in vietnAm
(DRACULA study)
PROTOCOLGroup of Hematology
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CONCEPTUAL FRAMEWORK
Baseline factors
Age
Gender
Occupation
Education
Weight
House owner
Previous plt donation
Lab Findings
Hemoglobin
Hematocrit
MCV
MCH
Platelets count
WBC count
Serum Protein
Platelets Donate
Satisfaction of blood donors
WHO-5 Well being
Adverse event
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Data dictionaries and/or code book
• Data dictionary makes the colunm definitions explicit
• Data dictionary is a table of information about the database itself
– rows representing fields
– colunm for field name, field type and field description
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viết tắc tên biến loại biến giá trị ghi chúsubid mã số chuỗi xxxxxxho họ và chữ lót chuỗi không dấuten tên chuỗi không dấungaync ngày vào nghiên cứu ngày nn/tt/nnnnnhom nhóm ngẫu nhiên phân loại 2.nhóm 2 tuần
3.nhóm 3 tuần4.nhóm 4 tuần
ngaysinh ngày sinh liên tục xxxx 1997-1945phai phái tính nhị giá 1.nam
2.nữhientc số lần hiến tiểu cầu liên tụchocvan trình độ học vấn phân loại 1.cấp I
2.cấp II3.cấp III4.đại học/cao đẳng
vieclam công việc làm phân loại 1.trí óc2.chân tay3.hưu trí4.không
Variable names• Most statistical programs allow long colunm
headings or variable names
• Some rules for variable names
– short enough to type quickly but long enough to be descriptive
– English meaning
– avoiding spaces and special characters (especially “dấu tiếng Việt”)
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Coded responses vs Free text• Defining a variable should include specifing its range of
allowed values
• Limiting responses to a ranged coded value > allowing free-text responses
• Set of response options to a question
– exhaustive (all possible options are provided)
– mutually exclusive (no two options are both correct)
• Consistent for coding yes/no (dichotomous) variables
• Consider “All that apply” questions
Data tables• All computer databases have one or more data
tables– rows = records or entities
– columns = fields or attributes
• Simplified data table – each row = an individual subject
– each column = a subject-specific attribute (name, age, sex, predictor and outcome variable)
• Should assign a unique identification number(subject ID) to each study participant
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Data entry with Excel
1. Two in one (one reads code, one enters data)
– Tab
– Freeze panes tool
– Data validation tool
2. Data form: each subject for each data entry form
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Freeze panes
To view only and retain some top rows (such as row 1 contains your variable names) and some important column (such as column 1 contains study id) when scroll bars move
• Put your cursor in the cell that is simultaneously below the rows you want to freeze and to the right of the columns you want to freeze
• View / Freeze Panes: select Freeze Panes and undo by selecting Unfreeze Panes
MS Excel for Public Health
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Data validation tool
• To limit value in a colunm to a certain range or a set of values
• To prevent invalid value from being entered into a cell
Data validation toolHighlight the colunm you want and then select Data / Data validation
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Data validation tool
In pop up menu: select type of data you want to enter and specify the range
Data validation toolNow, we enter an invalid value, an error message pops up
Note: not detect the incorrect value if it lies in the specified range
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Data form tool
Create a form in excel, and when enter the form, data will be entered into the spread sheet
Data form tool• File / Options
• In pop up menu: select Quick Access Toolbar, All Commands and then Form, Add and OK
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Data form tool
• Highlight all colunms you want
• Click icon Form in corner of left top
• Then enter data in data form
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Referrences
1. Alan C. Elliott, Linda S. Hynan, Joan S. Reisch, Janet P. Smith. 2006. Preparing Data for Analysis Using Microsoft Excel. Journal of Investigative Medicine. 54(6); 334-342.
2. Microsoft Excel for data entry – Health research. 2010. Fernandez Hospital, Hyderabad(https://fernandezresearch.files.wordpress.com/2010/09/data-entry-with-excel.pdf)